2. Inside the 'Documents' folder (Must be in documents due to Bluestacks) create a new folder called 'Wii U USB Helper' or something of your choosing.
3. Put the .apk file you downloaded into this new folder your created.

5. Once installed it will look like this (***NOTE*** It may say that it cannot connect to the internet, just give it a minute or so):

Bluestacks Freshly installed

6. Click on search in the top left and type in 'File explorer' and hit search.

Warning: Spoilers inside!

7. This will lead you to the 'One time setup'. Click continue.

Warning: Spoilers inside!

8. You will be prompted to log into or create a google account at this point. Proceed as instructed on screen.

Warning: Spoilers inside!

9. Once you have logged in, you will see the 'one time setup' again. Click 'Continue'.

Warning: Spoilers inside!

10. You will be prompted to login to your account again. Proceed as instructed.

Warning: Spoilers inside!

11. After logging in, it should bring you back here to the 'one time setup' for the last time. Click 'Let's Go'

Warning: Spoilers inside!

12. This should bring you to the Google Play Store. If it isn't already in the search bar, search for 'file explorer' and select 'File manager'. You can use any on there, but for the purposes of this tutorial this is the one I chose. Install and open the app.

Warning: Spoilers inside!

13. Click on 'Internal Storage'

Warning: Spoilers inside!

14. Navigate to >root>sdcard>windows>documents>Wii U USB Helper (Or whatever you decided to name your folder) and click on hikari06.usbhelper.usbhelper_go.apk and install then open.

Warning: Spoilers inside!

15. After opening, you will see a window asking where to store games to. Choose 'Custom location' and navigate to sdcard>windows>documents and click 'select' to the left of 'Wii U USB Helper'

Warning: Spoilers inside!

16. It will now ask you for a title key source. You should not have a hard time finding this on google.

Warning: Spoilers inside!

17. You are now ready to download and enjoy. Downloads will be found as shown in the image. Copy the folders you need to the 'install' folder of your SD card and use WUP Installer GX 2 as per usual.

Thanks for the tutorial! Do you know if there is any way to resume downloads via bluestacks or Wiiu Helper - I'm getting only partial downloads each time and can't find anywhere to resume anything I have started.

Thanks for the tutorial! Do you know if there is any way to resume downloads via bluestacks or Wiiu Helper - I'm getting only partial downloads each time and can't find anywhere to resume anything I have started.

Click to expand...

When you open the app in blue stacks it should show as a yellow/orange to show a partial download. Simply go to that game, scroll down and hit the download again. It will resume where it left off.

Note that this doesn't work on macOS 10.13 (High Sierra) because Bluestacks has major issues. It'll act like it isn't working but it'll refresh the screen if you move it between multiple monitors, or make it fullscreen or windowed. That makes it basically impossible to enter text though.
Oh, and the Bluestacks team have basically abandoned Mac because reasons (that's about the depth of their explanation).